Hi, there is no difference, the XS19 is on english ones, in the states it is the B19. I don't know about the fps, but you should get about 10.5-11ft/lbs power. They are very accurate in the right hands, and if you change the trigger for a GRTIII trigger from CharlieDaTuna (easy to do) it will feel like a totally better gun. I also suggest you look at the uk chinese owners site. I'll find you a couple of links in a moment.

http://ukchineseairgunforum.myfreeforum.org/

http://charliedatuna.com/GRT-III%20T...htm#grtiiiguns